ubus: fix various ACL processing problems

Bump ubus to current Git HEAD in order to:

 * Fix a null pointer access when user ACLs are loaded into memory
 * Fix wrong permission handling for uid=0, gid!=0 peers
 * Fix return code for permission defined cases
 * Fix socket error handling when the server connection dies
 * Make ACL file path configurable
 * Remove invalid usages of poll() when using a zero timeout

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

SVN-Revision: 47816

package/system/ubus/Makefile

@@ -1,13 +1,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ubus
-PKG_VERSION:=2015-11-19
+PKG_VERSION:=2015-12-09
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=http://git.openwrt.org/project/ubus.git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=259450f414d8c9ee41896e8e6d6bc57ec00e2b63
+PKG_SOURCE_VERSION:=766d49876f8f877f4846c16864e7f73b5a3917f7
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1